JP2000310108A - Outboard engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outboard engine capable of securing capacity of an oil pan constituted of a part of a mount case also when exhaust pipes are arranged on left and right sides. SOLUTION: In a four-stroke V-type outboard engine in which a plurality of cylinders sectioning a part of a combustion chamber are arranged so as to form a V-type, a crankshaft is longitudinally installed and an oil pan is provided on a lower side of a crank chamber storing the crankshaft, an engine block forming the combustion chamber and the crank chamber is bound to a mount case, two exhaust passage, 89 are provided at intervals on left and right sides on the mount case, these left and right exhaust passages 89 are made to communicate with the combustion chamber of a V-type bank, are connected each one of exhaust pipes on a downstream side and a packing surface 87b of the oil pan between the exhaust pipes is extended up to a rear side of positions of the exhaust pipes. Therefore, sufficient oil pan capacity can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor equipped with a vertical crankshaft engine, and more particularly to a mount case.

[0002]

2. Description of the Related Art The cylinder axis of an engine is made substantially horizontal,
In an outboard motor in which the crankcase is positioned closer to the hull and the cylinder head is positioned closer to the anti-hull, to support the outboard motor body against vibration with respect to the hull, the upper mount is disposed rearward from the vertical axis, and the support position is set. It is effective to make the value approximately coincide with the torque roll axis. Also, in order to secure sufficient mount frame rigidity against an impact load in the vertical direction, it is convenient if the left and right upper mounts form a closed loop. One example is U.S. Pat.
Some are known from the specification of US Pat. No. 500,594. On the other hand, in a four-stroke engine outboard motor, the oil pan is generally located below the cylinder block of the engine, and the return of the lubricating oil flows down into the oil pan.

[0003]

However, the structure disclosed in the above-mentioned U.S. Pat. No. 3,500,594 has the following problem.
A stroke engine was mounted, and no consideration was given to lubricating oil, so application to a 4-stroke engine was not possible.

An object of the present invention is to provide an outboard motor which can secure the capacity of an oil pan formed by a part of a mount case even when exhaust pipes are arranged on the left and right. .

[0005]

According to a first aspect of the present invention, a plurality of cylinders defining a part of a combustion chamber are arranged in a V-shape, and a crankshaft is vertically arranged.
In a four-stroke V-type outboard motor having an oil pan below a crank chamber for accommodating the crankshaft, an engine block forming the combustion chamber and the crank chamber is connected to a mount case. Exhaust passages are provided at right and left intervals, the left and right exhaust passages communicate with the combustion chamber of the V-shaped bank, and one exhaust pipe is connected one by one on the downstream side. The packing surface is extended to the rear from the exhaust pipe position.

According to the first aspect, even if the shape of the oil pan in the width direction is restricted by the two exhaust pipes, the oil reservoir can be provided behind the two exhaust pipes, so that a sufficient oil pan is provided. Capacity can be secured.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a center sectional view showing an outboard motor A to which the present invention is applied, FIG.
Is an external view of the outboard motor according to the present invention, and FIG. 11 is an explanatory view of the vibration isolating means.

In FIG. 10, reference numeral 20 denotes an outboard motor main body, which is mounted on the stern of the hull B by the outboard motor mounting means 1. 1 and 2, the outboard motor mounting means 1 swings through a stern bracket 2 fixed to the stern of the hull B and a tilt shaft 3 having a horizontal axis on the stern bracket 2. A swivel case 4 rotatably supported, a swivel shaft 5 rotatably supported by the swivel case 4 and having a substantially vertical axis, and an outboard motor body provided integrally above and below the swivel shaft 5 20
And upper and lower supporting members 6 and 8 for supporting. The upper support member 6 is integrally provided with a mounting portion 7 for an operation handle or a remote control steering cable extending forward. As shown in FIG. 11, the upper and lower support members 6, 8 are provided with anti-vibration means (anti-vibration rubber) 11, 1.
5 for supporting the outboard motor main body 20.
Returning to FIGS. In addition, 1
See FIG. 11 for 1,15.

The outboard motor body 20 has two cylinders 26, one above and the other below, with the crankshaft 22 oriented substantially vertically.
The V-type four-cylinder four-stroke engine 21 in which the V-type expansion angle of the left and right cylinder axes C and C is set to 90 ° or less is disposed at the upper part of the vehicle. The case means 60 is assembled below the lower case.
In the engine 21, reference numeral 23 denotes a journal portion of the crankshaft 22, reference numeral 24 denotes the same crank pin, reference numeral 25 denotes the same crank web, reference numeral 27 denotes a piston, reference numeral 28 denotes a piston pin, reference numeral 29 denotes a connecting rod, reference numeral 31 denotes a crankcase, reference numeral 32 denotes a cylinder block, and reference numeral 33 denotes a cylinder block. Cylinder head, 34 is a cylinder head cover, 35 is a timing belt device, 36 is a cam shaft, 37
Is a rocker arm, 38 is an intake valve, and 39 is an exhaust valve.

The above-described V-type four-cylinder four-stroke engine 2
1 is covered with an engine cover 41, and a silencer 4 is provided through an air inlet 42 provided in the engine cover 41.
3. Intake is performed through a carburetor 44 and an intake manifold 45 into left and right intake passages 46, 46 formed inside the V bank at right and left sides.
Reference numeral denotes an exhaust passage formed outside the V bank of the cylinder head 33, and reference numeral 49 denotes an exhaust passage formed outside the V bank of the cylinder block 32.

A mount case 51 is integrally provided below the engine 21 with bolts to the lower surfaces of the crankcase 31 and the cylinder block 32. That is, the engine block forming the combustion chamber and the crank chamber 31a is connected to the mount case 51. 52 is a starter motor, 53 is a flywheel, 54 is a ring gear, 55 is an oil pump provided at the lower end of the crankshaft 22, and 56 is an oil filter. The case means 60 assembled below the V-type four-cylinder four-stroke engine 21 includes an extension case 61 bolted to the lower surface of the mount case 51 and a gear case 71 bolted to the lower surface of the extension case 61.

The extension case 61 accommodates a vertical shaft 62 directly connected to the lower end of the crankshaft 22 and is connected below the vertical exhaust passages 49, 49 formed outside the V-bank of the cylinder block 32, respectively. The exhaust pipes 63, 63 and an oil pan 64 bolted to the lower surface of the mount case 51 are housed. 64a is an exhaust pipe support stay provided on the oil pan 64, 64b is an oil drain bolt, 65 is an upper mount lid integrally formed with the oil pan 64, 66 is an oil strainer, 6
7 is an oil pumping pipe, 68 is an oil suction passage formed in the cylinder block 32, and 69 is an oil discharge passage formed in the crankcase 31.

The gear case 71 includes a lower portion of the vertical shaft 62, a drive bevel gear 72 at a lower end thereof, a propeller shaft 74 having a propeller 73 as a propulsion means, and a pair of driven bevel gears 75, 76 at the ends thereof for forward and backward movement. , A dog clutch 77 for switching between forward and backward, an eccentric clutch operating mechanism 78 and an operating shaft 79 are housed. The operation shaft 79 protrudes outside from the lower part of the extension case 61, penetrates through the swivel shaft 5, protrudes upward, and is connected to an operation system in the engine room.

In the extension case 61 and the gear case 71, partitions 81, 82 are formed, which partition the front and rear portions behind the vertical shaft 62.
The rear of 2 is an exhaust chamber 83. In the submerged state at the lower part of the outboard motor body 20, the exhaust gas in the exhaust chamber 83 passes through the exhaust hole 85 between the propeller shaft holder 84 of the gear case 71 and the propeller 73 in the propulsion state by the propeller 73.
It is discharged into water from an exhaust port 86 in the central part. Exhaust gas in the idling state of the engine 21 is discharged from the upper part of the exhaust chamber 83 to the outside air through the exhaust passage 87 on the lower surface of the mount case 51 and the exhaust port 88 on the upper part of the extension case 61.

In the gear case 71, a cooling water intake chamber 91 is formed around the lower part of the vertical shaft 62 in front of the partition wall 82, and a water pump 92 is provided above the cooling water intake chamber 91. A cooling water inlet 95 provided in the upper mounting lid 65 via
It is connected to the. The cooling water inlet 95 communicates with a cooling water passage 96 formed on the lower surface of the mount case 51 as shown in FIGS.
The cooling water passages 97, 97 on the upper surface side communicate with each other via a.

Outside the cooling water passages 97, 97, drain holes 98, 9 penetrating the mount case 51 in the vertical direction.
An exhaust passage 89, 89 communicating with the left and right combustion chambers of the V-type engine described above is formed next to the exhaust passage. The exhaust passages 89, 89 are arranged at an interval in the left-right direction, the upper part is connected to the exhaust passage 49 of the cylinder block 32, and two exhaust pipes 63, 63 are provided downstream.
Are connected to each other. Figure 4 shows the mounting case 5
In the bottom view of FIG. 1, two exhaust pipes 63, 63 disposed on the downstream side are connected to left and right exhaust passages 89, 89.

In the center of the mount case 51, there is formed an upper mounting concave portion 00 which is opened on the lower surface. The vibration isolating means 11 of the upper support member 6 is accommodated in the upper mount concave portion 00. ing. That is,
As shown in FIG. 5, the upper vibration isolator 11 accommodates the upper mount rubber 12, which is an elastic body in which the core bar 13, which is a rigid body extending in the left-right direction, is embedded in the upper mount recess 00 from below. Then, the upper support member 6 and the left and right forked arms 6a, 6a and the core metal 13 are connected to the bolt nut 14,
14. After that, the concave portion 00 is closed by the upper mounting lid portion 65 bolted to the lower surface of the center of the mount case 51. The upper mounting lid 65 is provided with an extending leg up to the anti-vibration rubber 11 if necessary. In FIG. 5, the upper mount rubber 11 is symmetrical in the left-right direction.

A lower mounting through-hole 101 is formed in the lower part of the extension case 61 on both left and right sides, and the lower support member 8 is prevented from passing through the lower mounting through-hole 101. The vibration means 15 is housed. That is, as shown in FIG. 6, the lower vibration isolator 15 penetrates an upper mount rubber 16, which is an elastic body in which a core metal 17, which is a rigid body extending in the left-right direction, is embedded, from one side. The lower support member 8 is inserted into the mouth 101 and the left and right forked arms 8a, 8a and
And the bolts and nuts 19,
19. Thereafter, the through-hole 101 is closed by lid members 102, 102 bolted to both left and right sides of the extension case 61. Reference numeral 103 denotes a reinforcing portion of the extension case formed at the front part of the opening of the through-hole 101 so as to be substantially flush with the lid member 102.
In FIG. 6, the lower mount rubber 15 is bilaterally symmetric.

Further, as shown in FIGS. 1, 3 and 4, a main oil return port 111 is formed in the mount case 51 at the rear side opposite to the upper mounting concave portion 00 with the cooling water passage 96 interposed therebetween. In addition, a concave wall surface 112 opening to the upper surface and a concave wall surface 113 opening to the lower surface are formed. On the left and right sides of the upper mounting concave portion 00, the auxiliary oil return passages 114, 114 are opened on the lower surface, and are formed in the front-rear direction with the heat insulating space 51a closed by the upper mount cover 65 interposed therebetween. Have been. In FIG. 3, reference numeral 115 denotes a connection surface with the crankcase 31, and reference numeral 116 denotes a connection surface with the cylinder block 32. In FIG. 4, reference numeral 117 denotes a connection surface between the oil pan 64 and the upper mount cover 65, and reference numeral 118 denotes a connection surface with the extension case 61.

Next, the oil circulation path of the engine 21 will be described. First, the oil in the oil pan 64 is removed by the oil pump 55 provided at the lower end of the crankshaft 22.
The oil pumped through the strainer 66, the pumping pipe 67, and the suction passage 68 and discharged to the discharge passage 69 after the oil filter passes through an oil passage 121 formed in the crankcase 31 and an oil passage formed in the cylinder block 32. The oil is supplied to a necessary lubrication unit through an oil passage 123 formed in the cylinder head 33 and the like.

Then, the crankcase 3 provided for lubrication
1 and oil from the cylinder head flow down to the upper surface of the mount case 51 and flow into the main oil return port 111 and the sub oil return passages 114, 114. The auxiliary oil return passages 114, 114 are effective as oil return when the outboard motor is tilted up.

Next, the cooling water circulation path of the engine 21 will be described. First, the water in the water channel is supplied to the gear case 7 by a water pump 92 provided below the vertical shaft 62.
1, a cooling water intake chamber 91, a cooling water discharge port 93, a hose 9
4 through the cooling water inlet 95 of the upper mounting lid 65 and the cooling water passage 96 on the lower surface of the mounting case 51.
To the cooling water passages 97 on the upper surface side through the left and right through holes 96a. The cooling water passages 97, 97 are provided at the sides of the exhaust passages 49, 49.
Cooling water passages 131, 1 which are open and communicate with each other
31 so that the cooling water is supplied to the cylinder block 1
Each of the cylinders 2 passes through cooling water passages 131, 131 formed side by side on both exhaust passages 49, 49 outside the V-bank 31.
6 ... cooling water passages 132 formed around the periphery, exhaust passages 48 of the cylinder head 33 ... cooling water passages 1 formed around the periphery
33 ... and each combustion chamber 47 ... cooling water passage 1 formed around
Flows to 34 ...

The hot water used for cooling in this way is supplied to both cooling water passages 131, outside the V-bank of the cylinder block 31.
The water is discharged into the extension case 61 from the water outlets 98, 98 of the mount case 51 through the water drain passages 135, 135 formed side by side. FIG.
The middle 136 is a thermostat provided between the cooling water passage 132 and the drain passage 135.

As shown in FIG. 4, an exhaust passage 87 on the lower surface of the mount case 51 formed between the upper part of the exhaust chamber 83 in the extension case 61 and the exhaust port 88 is provided around the connecting surface 117 with the oil pan 64. Are separated into a chamber 87a and a chamber 87d communicating with the chamber 87d through through holes 87c formed in a partition wall 87b behind the chamber 87a.
A porous packing P is interposed between the extension case 61 and the extension case 61 as shown in FIG. By the way, as shown in FIG. 4, the packing surface on which the packing P is interposed is formed by the aforementioned partition wall 87b and the left and right exhaust passages 89, 8.
9, it extends rearward from the exhaust pipe position (the exhaust pipes 63, 63 connected to the exhaust passages 89, 89) (the upper part in FIG. 4 is the rear, and the lower part is the front).

According to the outboard motor having the above configuration, in particular,
With respect to the upper mount portion of the mount case 51 below the engine 21, the upper anti-vibration means in which the core metal 13 extending in the left-right direction is embedded in the upper mount rubber 12 in the upper mount concave portion 00 formed in the lower surface of the center part of the mount case 21. The upper mount 11 can be mounted compactly without affecting the external dimensions of the outboard motor main body 20 because the lower mount 11 is mounted and accommodated from below. And the support member 6
The left and right arms 6a, 6a and the metal core 13 of the upper mount rubber 12 form a closed loop, and therefore have sufficient rubber frame rigidity against a vertical impact load generated during jumping. It has become.

In addition, the main oil return port 111 and the sub oil return passage 11 which communicate with the oil pan 64 while avoiding the upper mount concave portion 00 are provided in the mount case 51.
4, 114, the V-shaped 4
An oil return structure suitable for an outboard motor equipped with a four-stroke engine 21 such as a cylinder is provided.
The cylinder block 32 and the cylinder head 3
The oil from the 3,33 side is shown in FIG.
As shown in FIG. 4, it can directly fall to the left and right of the main oil return port 111 of the mount case 51 and be returned independently to the oil pan 64. In the above embodiment, oil flows into the left and right main oil return ports 111 and returns into the oil pan 64.

FIGS. 7 to 9 show another embodiment of the return passage. In this embodiment, the oil is supplied to the main oil return port 111.
Independent oil return passages 215 and 216 are provided on the left and right sides of the oil pan so that the oil flows in independently and returns to the inside of the oil pan 64. Also in the present embodiment, the structure of the outboard motor is basically the same as that described above, and a detailed description thereof will be omitted, and necessary reference numerals will be described.

7 to 9, reference numeral 21 'denotes an engine, 32a denotes a return passage from a crank chamber of a cylinder block, R1 and R2 denote left and right cam chambers, and 201 and 202 denote oil provided in left and right cylinder heads. Return path, 2
03 and 204 are oil return passages to the left and right cam chambers,
05 and 206 are oil return passages provided in the left and right banks of the cylinder block, and 207 and 208 are oil return passage openings (block outlets). Also, 209,
211, 210, 212 are packing surfaces (walls) provided on the lower surface of the cylinder block, and concave portions, 213, 214.
Is the packing surface (wall) provided on the top of the mount case,
Reference numerals 215 and 216 denote the above oil return passages, which penetrate the mount case vertically, and 217 and 218 denote left and right oil return pipes attached to the mount case.
219 and 220 are outlets of the pipe.

In the above, the return oil from the cam chamber is guided into the oil pan by the cylinder block and the walls 209, 210, 211, 212 of the mount case without being merged with the return oil from the crank chamber.
Further, the oil is returned to the vicinity of the suction port of the strainer communicating with the suction side of the oil pump by the left and right pipes, so that the oil is smoothly returned to the oil pan by the suction force of the pump. or,
Since the left and right pipes are independent, even if the outboard motor is slightly inclined to the left or right, the oil is returned smoothly. It should be noted that pipes and the like can be appropriately shared or omitted.

In the embodiment, the detailed structure of each part has been described. However, it is needless to say that the specific detailed structure can be appropriately changed.

[0031]

As described above, according to the outboard motor of the present invention,
A plurality of cylinders defining a part of the combustion chamber are arranged so as to form a V-shape, the crankshaft is vertically arranged, and an oil pan is provided below the crank chamber that houses the crankshaft. In a stroke V-type outboard motor, an engine block forming the combustion chamber and the crankcase is connected to a mount case, and
Two exhaust passages are provided at an interval on the left and right, the left and right exhaust passages communicate with the combustion chamber of the V-shaped bank, and one exhaust pipe is connected one by one on the downstream side. Was extended to the rear of the exhaust pipe position. Therefore, in the first aspect, even if the shape of the oil pan disposed therebetween is limited by the two exhaust pipes in the lateral width direction, the oil reservoir can be provided behind the two exhaust pipes. A large oil pan capacity can be secured.

[Brief description of the drawings]

FIG. 1 is a side view of a center section of an outboard motor according to the present invention.

FIG. 2 is a cross-sectional view of the engine part.

FIG. 3 is a plan view of a mount case part.

FIG. 4 is a bottom view of the mount case part.

FIG. 5 is a partially broken plan view of an upper mount portion.

FIG. 6 is a cross-sectional view of a lower mount portion.

FIG. 7 is an explanatory view of the engine of another embodiment as viewed from below.

FIG. 8 is a plan view of a mount case according to another embodiment.

FIG. 9 is an enlarged sectional view of a main part of an oil suction and return port portion of the another embodiment.

FIG. 10 is an external view of an outboard motor according to the present invention.

FIG. 11 is an explanatory view of an anti-vibration means for an outboard motor according to the present invention.

[Explanation of symbols]

Reference numeral 21: engine, 22: crankshaft, 26: cylinder, 31: crankcase, 31a: crankcase,
51: mount case 63: exhaust pipe 87b: partition wall as packing surface 89: exhaust passage

Claims (1)

[Claims] Claims 1. A plurality of cylinders defining a part of a combustion chamber are arranged so as to form a V-shape, and a crankshaft is installed vertically,
In a four-stroke V-type outboard motor having an oil pan below a crank chamber for accommodating the crankshaft, an engine block forming the combustion chamber and the crank chamber is connected to a mount case. Exhaust passages are provided at right and left intervals, the left and right exhaust passages communicate with the combustion chamber of the V-shaped bank, and exhaust pipes are connected one by one on the downstream side. An outboard motor, wherein a packing surface extends to a position rearward of an exhaust pipe position.